I've become quite concerned that some of the impurities in the epsom salts I buy are possibly present at levels that are harmful. I've been doing some research into the issue but I'm far from an expert and still not sure if particularly the arsenic impurities could be bad for you. Would be most interested in peoples input on the quora question I have set up here :https://www.quora.com/Could-soaking-in-the-heavy-metal-impurities-in-the-epsom-salts-in-a-float-tank-be-bad-for-you
I've summarised what I've understood so far in the 'answer wiki' of the quora question. Would be most grateful if others had more information to add. Particularly would the arsenic impurities in epsom salts be likely to be the less harmful pentavalent compounds or trivalent??
I live in Chiang Mai Thailand. The salts with the specification as in the quora question are all that are available to me at a reasonable price.